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Land Pollution - Pesticides and Biomagnificaiton

The soil is s...

Question

The soil is soft during wet and very hard during dry is _______.

A

Red soil

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B

Black soil

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C

Alluvial soil

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D

Desert soil

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Solution

The correct option is A Black soil
The soil is soft during wet and very hard during dry is Black Soil.

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Q. During the soil exploration of a site, the site engineer collected the soil sample which is black cotton soil in saturated condition having volume 15 ml and total mass 20 gm. After putting in oven the volume the volume of dry soil is 10.9 ml the shrinkage ratio of soil if specific gravity of soil is 2.75 is [Take

ρ w = 1 g m / c c

] [ Take dry mass = 17.2 gm]

Q. Consider the following statements:
1. Each year, black cotton soil appreciably shrinks during dry season and swells during rainy season. This alternate cycle of shrinking and swelling causes severe stresses in structures supported directly by such soil.

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3. Shrinking and swelling of black cotton soils are observed only upto a certain depth below the ground level. Below that level, there is neither shrinking nor swelling.

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